This Collet Prop Adapter 8mm- 3/8x24 Prop Shaft is compatible with the Spektrum Avian 5055-500Kv (SPMXAM4740), Avian 5055-650Kv (SPMXAM4745), Avian 5065-450Kv (SPMXAM4770), Avian 6362-250Kv (SPMXAM4795) and Avian 6362-200Kv (SPMXAM4796) Outrunner Brushless Motors.